Another fix needed for bug #9236 - ACL masks incorrectly applied when setting ACLs.

Another fix needed for bug #9236 - ACL masks incorrectly applied when setting ACLs.

Not caught by make test as it's an extreme edge case for strange
incoming ACLs. I only found this as I'm making raw.acls and smb2.acls
pass against 3.6.x and 4.0.0 with acl_xattr mapped onto a POSIX backend.

An incoming inheritable ACE entry containing only one permission,
WRITE_DATA maps into a POSIX owner perm of "-w-", which violates
the principle that the owner of a file/directory can always read.

Signed-off-by: Jeremy Allison <jra@samba.org>
Reviewed-by: Michael Adam <obnox@samba.org>
Autobuild-User(master): Michael Adam <obnox@samba.org>
Autobuild-Date(master): Thu Nov 15 19:52:52 CET 2012 on sn-devel-104